List Payment Rails

GET /v1/payment-methods/rails

curl "https://api.bachs.io/v1/payment-methods/rails?payment_method=BANK_TRANSFER&currency=NGN&country_code=NG" \
  -H "Authorization: Bearer sk_live_abc123xyz..."

{
  "payment_method": "BANK_TRANSFER",
  "currency": "NGN",
  "country_code": "NG",
  "rails": [
    {
      "id": "bank_transfer_ng",
      "name": "Bank Transfer Nigeria",
      "active": true
    }
  ]
}